last executing test programs:

2.511424ms ago: executing program 1 (id=2):
getpid()
symlinkat(0x0, 0xffffffffffffffff, 0x0)
socket$inet6_sctp(0x1c, 0x0, 0x84)
ksem_trywait(0x0)
ksem_init(&(0x7f0000000000)=<r0=>0x0, 0x1)
ksem_wait(r0)
ksem_destroy(r0)
ksem_init(&(0x7f0000000040), 0x80000000)
r1 = kqueue()
freebsd11_kevent(r1, 0x0, 0x0, 0x0, 0x0, 0x0)
dup2(0xffffffffffffffff, 0xffffffffffffffff)
rfork(0x0)
ksem_open(&(0x7f00000000c0), &(0x7f0000000100)='\\{.]-*^(%$,-&},\x00', 0x200, 0x0, 0x0)
ksem_getvalue(0x0, &(0x7f0000000200))

1.422329ms ago: executing program 0 (id=1):
r0 = socket$inet_sctp(0x2, 0x5, 0x84)
connect$inet(r0, &(0x7f0000000140)={0x10, 0x2, 0x0, @remote={0xac, 0x14, 0x0}}, 0x10)
dup2(0xffffffffffffffff, 0xffffffffffffffff)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(0xffffffffffffffff, 0x84, 0x105, 0x0, &(0x7f0000001700))
r1 = socket(0x0, 0x0, 0x0)
setsockopt$inet6_IPV6_HOPOPTS(r1, 0x29, 0x31, 0x0, 0x28)
sendto(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)=@in6={0x1c, 0x1c, 0x3, 0x800000, @empty}, 0x1c)
sendto$inet6(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)={0x1c, 0x1c, 0x1, 0x0, @rand_addr="fee3a38e5cac1c51deba3c6b07a430a0"}, 0x1c)
kqueue()
syz_emit_ethernet(0x42, 0x0)
r2 = socket$inet_sctp(0x2, 0x5, 0x84)
r3 = socket$inet_sctp(0x2, 0x5, 0x84)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(r3, 0x84, 0x28, &(0x7f0000000280)={0x1, [<r4=>0x0]}, &(0x7f00000002c0)=0x8)
setsockopt$inet_sctp_SCTP_CONTEXT(r2, 0x84, 0x1a, &(0x7f0000000180)={r4}, 0x8)
socket$inet6_sctp(0x1c, 0x1, 0x84)
socket$inet6_sctp(0x1c, 0x1, 0x84)
r5 = socket(0x2, 0x1, 0x0)
setsockopt$inet_tcp_TCP_FUNCTION_BLK(r5, 0x6, 0x2000, &(0x7f0000000080)={'bbr\x00'}, 0x24)
setsockopt$inet_tcp_int(r5, 0x6, 0x1, &(0x7f0000000040)=0x7, 0x4)
connect$inet(r5, &(0x7f00000000c0)={0x34, 0x2, 0x2, @rand_addr=0xfffffffe}, 0x10)
sendmsg$inet6_sctp(r5, &(0x7f00000002c0)={&(0x7f0000000280)=@in={0x10, 0x2, 0x1, @multicast2}, 0x10, &(0x7f0000000100)=[{&(0x7f00000005c0)="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", 0x16e}], 0x1, 0x0, 0x0, 0x81}, 0x0)
rfork(0x85000)

649.095µs ago: executing program 1 (id=5):
r0 = socket$inet_sctp(0x2, 0x0, 0x84)
connect$inet(r0, &(0x7f0000000140)={0x10, 0x2, 0x0, @remote={0xac, 0x14, 0x0}}, 0x10)
r1 = dup2(0xffffffffffffffff, 0xffffffffffffffff)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(r1, 0x84, 0x105, 0x0, &(0x7f0000001700))
r2 = socket(0x0, 0x0, 0x0)
setsockopt$inet6_IPV6_HOPOPTS(r2, 0x29, 0x31, 0x0, 0x28)
sendto(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)=@in6={0x1c, 0x1c, 0x3, 0x800000, @empty}, 0x1c)
sendto$inet6(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)={0x1c, 0x1c, 0x1, 0x0, @rand_addr="fee3a38e5cac1c51deba3c6b07a430a0"}, 0x1c)
r3 = kqueue()
kevent(r3, &(0x7f0000000040)=[{0x0, 0xfffffffffffffff9, 0x9, 0x8, 0x0, 0x0, [0x0, 0x0, 0x7, 0x40000000000000]}], 0x1, 0x0, 0x0, 0x0)
syz_emit_ethernet(0x42, 0x0)
r4 = socket$inet_sctp(0x2, 0x5, 0x84)
r5 = socket$inet_sctp(0x2, 0x5, 0x84)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(r5, 0x84, 0x28, &(0x7f0000000280)={0x1, [0x0]}, &(0x7f00000002c0)=0x8)
setsockopt$inet_sctp_SCTP_CONTEXT(r4, 0x84, 0x1a, 0x0, 0x0)
socket$inet6_sctp(0x1c, 0x1, 0x84)
socket$inet6_sctp(0x1c, 0x1, 0x84)
r6 = socket(0x2, 0x1, 0x0)
setsockopt$inet_tcp_TCP_FUNCTION_BLK(r6, 0x6, 0x2000, &(0x7f0000000080)={'bbr\x00'}, 0x24)
setsockopt$inet_tcp_int(r6, 0x6, 0x1, &(0x7f0000000040)=0x7, 0x4)
connect$inet(r6, &(0x7f00000000c0)={0x34, 0x2, 0x2, @rand_addr=0xfffffffe}, 0x10)

268.677µs ago: executing program 3 (id=4):
r0 = accept4(0xffffffffffffffff, 0x0, 0x0, 0x10000000)
ioctl$DIOCGETRULES(0xffffffffffffffff, 0xcbe04406, &(0x7f0000002500)="1a96edd80763523d70657775757adee398")
sendmsg$unix(0xffffffffffffffff, 0x0, 0x0)
mkdir(0x0, 0x0)
r1 = socket$inet_sctp(0x2, 0x1, 0x84)
bind$inet(r1, &(0x7f0000000280)={0x10, 0x2, 0x3}, 0x10)
openat$filemon(0xffffff9c, &(0x7f00000002c0), 0x0, 0x0)
freebsd10_pipe(&(0x7f0000000100))
open(&(0x7f0000000480)='./file0\x00', 0x0, 0xe)
socket$inet_sctp(0x2, 0x1, 0x84)
sendto$inet(r0, 0x0, 0x0, 0x100, 0x0, 0x0)
profil(0x0, 0x0, 0x0, 0x0)
r2 = socket$inet_sctp(0x2, 0x1, 0x84)
setsockopt$inet_sctp_SCTP_INITMSG(r2, 0x84, 0x3, &(0x7f0000000340)={0x8003}, 0x8)
rfork(0x7010)
open(0x0, 0x0, 0x0)
socket$inet_sctp(0x2, 0x5, 0x84)
socket$inet6_sctp(0x1c, 0x5, 0x84)
connect$inet(r2, &(0x7f0000000140)={0x10, 0x2, 0x3, @rand_addr=0xff}, 0x10)

0s ago: executing program 2 (id=3):
r0 = socket$inet_sctp(0x2, 0x5, 0x84)
connect$inet(r0, &(0x7f0000000140)={0x10, 0x2, 0x0, @remote={0xac, 0x14, 0x0}}, 0x10)
r1 = dup2(0xffffffffffffffff, 0xffffffffffffffff)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(r1, 0x84, 0x105, 0x0, &(0x7f0000001700))
r2 = socket(0x0, 0x0, 0x0)
setsockopt$inet6_IPV6_HOPOPTS(r2, 0x29, 0x31, 0x0, 0x28)
sendto(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)=@in6={0x1c, 0x1c, 0x3, 0x800000, @empty}, 0x1c)
sendto$inet6(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000080)={0x1c, 0x1c, 0x1, 0x0, @rand_addr="fee3a38e5cac1c51deba3c6b07a430a0"}, 0x1c)
r3 = kqueue()
kevent(r3, &(0x7f0000000040)=[{0x0, 0xfffffffffffffff9, 0x9, 0x8, 0x0, 0x0, [0x0, 0x0, 0x7, 0x40000000000000]}], 0x1, 0x0, 0x0, 0x0)
syz_emit_ethernet(0x42, 0x0)
socket$inet_sctp(0x2, 0x5, 0x84)
r4 = socket$inet_sctp(0x2, 0x5, 0x84)
getsockopt$inet_sctp_SCTP_GET_ASSOC_ID_LIST(r4, 0x84, 0x28, &(0x7f0000000280)={0x1, [0x0]}, &(0x7f00000002c0)=0x8)
socket$inet6_sctp(0x1c, 0x1, 0x84)
r5 = socket(0x2, 0x1, 0x0)
setsockopt$inet_tcp_TCP_FUNCTION_BLK(r5, 0x6, 0x2000, &(0x7f0000000080)={'bbr\x00'}, 0x24)

kernel console output (not intermixed with test programs):

Warning: Permanently added '10.128.1.119' (ED25519) to the list of known hosts.
SYZFAIL: failed to send rpc
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
fd=3 want=448 sent=0 n=-1 (errno 32: Broken pipe)
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800


FreeBSD/amd64if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000
 (ci-freebsd-maiif_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000
n-5.c.syzkaller.if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800
internal) (ttyu0if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800
)

login: if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb800
show all locks
Password:if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000
if_delmulti_locked: detaching ifnet instance 0xfffffe00079fb000

Login incorrect
login: if_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546000
show uma
Password:if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800
if_delmulti_locked: detaching ifnet instance 0xfffffe0058546800